Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc192a1b9f52908…

MALICIOUS

PDF

75.4 KB Created: 2021-03-30 03:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6b857bada1ea28cc537cfbc17167fddc SHA-1: a6e5b28810a34d1b11b7a922c9f4f11092812a55 SHA-256: 5fc192a1b9f52908b5ca39d2a0d91f635e2bf94f66afb68cc99ed6215e42dbba
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it is part of a link farm, with numerous external URLs embedded within the document, likely to distribute malware or facilitate phishing. The primary external URL identified is https://maypoin.ru/wix?keyword=story+graph+worksheet+pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/wix?keyword=story+graph+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/nigudovowa/cibi7Q6/ancestors_legacy_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/reromiwo/FU7hbfY/hearts_on_fire_stackable_rings.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/how_to_change_ink_on_canon_printer_tr8520.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/class_9_english_beehive_the_road_not_taken.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/hc4XJE4/vurizitazadajavusiw.pdfIn PDF document text
    • http://medazuxa.mywebcommunity.org/vigasaritadawubosusopu.pdfIn PDF document text
    • http://digovin.getenjoyment.net/jiruwi.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/land_of_stories_movie_release_date_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/lunilageruvu/jgcUOid/barbecue_grill_walmart._ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fc9a8e44-b853-4378-b933-957c6fa9ceda.filesusr.com/ugd/1da781_2e3bd697765d497e91c1ba4efa790d79.pdf?index=trueIn PDF document text
    • http://jimarol.myartsonline.com/consecuencias_del_alcoholismo_en_la_adolescencia.pdfIn PDF document text
    • https://3c31dc6e-14a3-4e60-a373-897e90814001.filesusr.com/ugd/9e17d8_454a584291514c9db49cad0bc265726e.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_30b299c0561245ab83a17c5ab187005d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wurivuve/zalando_returns_form.pdfIn PDF document text
    • http://fajenadiwizowo.atwebpages.com/shark_navigator_lift_away_pet_vacuum_uv500wm.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_239da68de598431facb2e2ab2ed647c0.pdf?index=trueIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_6ee066083dcd4d0da8db0585caae2035.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/forupokisip/microsoft_word_boat_bill_of_sale_template.pdfIn PDF document text
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_bee0dec6013a4597b696c49ebd754a51.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_39b307c46b714e50aa218cea0f255bb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tevigotu/4765788633.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/4139004473.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_472e35db8a28476699aa033ffc7ca9d7.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 5632 bytes
SHA-256: fb82e3f42d5d6a80f16bc9685aa1dfde9bcc21478188107bf74f58ca09a1c1c1
font_01_sfnt_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 10372 bytes
SHA-256: ec2a4a082a6911db07ec38ff8a3922ee48897473919747e01f655f114120e1fe